OBD-II Trouble Codes

P0046 Code: Turbo/Supercharger Boost Control A Circuit Range Performance

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On-board diagnostic (OBD) codes are designed to help mechanics and vehicle owners like you identify possible issues with your vehicle. But before attempting any fixes to resolve the codes retrieved by your scan tool, it’s important to know exactly what they mean.

The P0046 code is one of many error codes that may be set by your vehicle’s primary computer. Read on to learn more about this code’s possible triggers and common symptoms.

What Does the P0046 Code Mean?

Diagnostic trouble code (DTC) P0046 stands for “Turbo/Supercharger Boost Control ‘A’ Circuit Range Performance.” This trouble code is logged when the powertrain control module (PCM) in your vehicle detects a potential problem with the variable geometry turbocharger (VGT) actuator or boost control solenoid.

This code may be set in newer vehicle models equipped with VGT systems when the PCM detects a potential problem with the VGT actuator or its circuit. On older models with traditional turbocharger/supercharger systems, this code may be set if the PCM perceives a possible issue with the performance of the boost control solenoid (also known as the wastegate control valve).

The “A” in this trouble code indicates the potential issue is in a certain portion of the system circuit, instead of a specific component or symptom.

Both the turbocharger and the supercharger are forced air induction devices. They forcibly pump air into the engine to increase its power. In modern turbocharged cars, the VGT features internal valves that can be adjusted to alter boost. In older models with a traditional turbocharger/supercharger, the boost is controlled via a wastegate or bypass valve.

The code P0046 may be set if the PCM determines a potential issue with the operation or performance of the VGT actuator or boost control solenoid. Depending on the severity of the problem, other related DTCs may also be stored. Code P0046 is very similar to error codes P0045, P0047, P0048, P0049, and P004A.

supercharged v8 engine
Both the turbocharger and the supercharger are forced air induction devices. They forcibly pump air into the engine to increase its power.

Note: The definition of code P0046 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P0046 Code?

Here are the most common causes of a P0046 code:

What are the Common Symptoms of the P0046 Code?

You may notice the following symptoms if you drive a vehicle with a stored P0046 trouble code:

How to Diagnose the P0046 Code

To avoid the possibility of engine damage, code P0046 should be resolved immediately. However, diagnosing this code can be tricky as it has several possible triggers. Always follow the diagnostic procedure specified by your vehicle’s manufacturer. The steps for diagnosing a code P0046 on a Toyota, for instance, may prove different from testing for a code P0046 on a Ford.

Refer to a repair manual for the appropriate diagnostic strategy. If you’re not well-versed in auto repair, it would be best to leave the job to a mechanic.

mechanic inspecting turbocharger
If you’re not well-versed in auto repair, it would be best to leave the job to a mechanic.

How to Fix the P0046 Code

P0046 may share similar triggers and symptoms with other engine codes. However, there is no one-size-fits-all fix for these codes. All vehicles are different, so you should always refer to your vehicle’s factory repair information before DIY-ing any repairs.

Code P0046 is a complicated code, so you should always consult a repair manual or repair database before taking any steps to resolve it. If you aren’t confident in your automotive repair skills, it may be best to enlist the help of a professional.

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